On Wed, 26 Feb 2014 18:44:10 -0500, H. S. Teoh <hst...@quickfur.ath.cx>
wrote:
First of all, the way ByLine works is kinda tricky, even in the previous
releases. The underlying cause is that at least on Posix, the underlying
C feof() call doesn't actually tell you whether you're really at EOF
until you try to read something from the file descriptor.
This is not a posix problem, it's a general stream problem.
A stream is not at EOF until the write end is closed. Until then, you
cannot know whether it's empty until you read and don't get anything back.
Even if a primitive existed that allowed you to tell whether the write end
was closed, you can race this against the other process closing it's write
end.
I think the correct solution is to block on the first front call. We may
be able to do this without storing an additional variable.
-Steve
